Re: [Gcl-devel] Re: mprotect

[Camm Maguire <camm@enhanced.com>]

Greetings!

Gerhard Tonn <GerhardTonn@swol.de> writes:

> On Tuesday 18 June 2002 17:40, Camm Maguire wrote:
> > Greetings!  In porting gcl, I'm trying to read the fault address on
> > writing to an array mprotect'ed to PROT_READ.  This gives a SIGSEGV on
> > all Debian arches except s390.  Anyone know why?  Is there an
> > equivalent mechanism here?
> >
> 
> It's a known bug on s390. It will be fixed with the next kernel version. Are 
> you working on testing or unstable?
> 

I see, thanks.  I'm only working on whatever is on trex.debian.org.
In case you did not catch the earlier discussion, this is for gcl,
which basically mprotects its lisp heap PROT_READ only, then on write
attempt, catches the segfault, locates the fault address in the
handler, marks the page read/write, and schedules the page for garbage
collection.  

Its looking like there is enough variation among the Debian arches
regarding this functionality that some run-time test will be
necessary. 

Thanks again,

> Gerhard
> 
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> 

-- 
Camm Maguire			     			camm@enhanced.com
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"The earth is but one country, and mankind its citizens."  --  Baha'u'llah


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